We perform full quenching and tempering after bending for critical applications.
Tenaris works alongside world-class bending manufacturers to provide high quality bending solutions for oil and gas pipelines, either onshore or offshore. The bends manufacturing and testing procedures exceed all quality standards required by the oil and gas industry.
Our customers are able to obtain a wide range of bend geometries and total design flexibility with customized radius and angle (other than the conventional 45º and 90º) bends.
Our qualified subcontractors carry out hot induction bending with state-of-the-art technology that enables full control of the bending process, as well as total monitoring of bending parameters.
We have managed the supply of bending solutions for many of the deepest projects in the world. These include, for instance, projects such as Chinook & Cascade, Thunder Horse, Independence and Tahiti in the Gulf of Mexico, and the Pazflor, Kizomba A, C & D, Greater Plutonio, Dalia and Bonga projects in West Africa.
The production of high-quality bends depends on the manufacturing process of the steel pipe that is transformed into the bend. During the hot induction bending process, thinning inevitably occurs on the extrados of the bend. Therefore, a tailor-made mother pipe must be produced in order to comply with minimum wall thickness after bending.
Obtaining the most suitable chemical composition is also important as this enables the recovery of the pipe’s material properties following the hot induction bending process. Depending on pipe dimensions, grades and final bending conditions, alloying elements can be added to the steel in order to guarantee the required hardness and mechanical properties and to ensure that the bend’s chemistry matches as much as possible the line pipe’s chemistry.
Heat treatment is carried out on each bend in order to achieve the required mechanical properties after bending. For critical applications, such as high-strength steel, heavy wall, sour service or low-temperature, we also perform full quenching and tempering after bending, as a preferred process.
Machining of the bend ends guarantees optimum tolerances of inside diameters, as we ensure the bend has at least the minimum working tolerances of the mother pipe.